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1 | /* Header file for gimple iterators. | |
2 | Copyright (C) 2013-2014 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 3, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef GCC_GIMPLE_ITERATOR_H | |
21 | #define GCC_GIMPLE_ITERATOR_H | |
22 | ||
23 | /* Iterator object for GIMPLE statement sequences. */ | |
24 | ||
25 | struct gimple_stmt_iterator | |
26 | { | |
27 | /* Sequence node holding the current statement. */ | |
28 | gimple_seq_node ptr; | |
29 | ||
30 | /* Sequence and basic block holding the statement. These fields | |
31 | are necessary to handle edge cases such as when statement is | |
32 | added to an empty basic block or when the last statement of a | |
33 | block/sequence is removed. */ | |
34 | gimple_seq *seq; | |
35 | basic_block bb; | |
36 | }; | |
37 | ||
38 | enum gsi_iterator_update | |
39 | { | |
40 | GSI_NEW_STMT, /* Only valid when single statement is added, move | |
41 | iterator to it. */ | |
42 | GSI_SAME_STMT, /* Leave the iterator at the same statement. */ | |
43 | GSI_CONTINUE_LINKING /* Move iterator to whatever position is suitable | |
44 | for linking other statements in the same | |
45 | direction. */ | |
46 | }; | |
47 | ||
48 | extern void gsi_insert_seq_before_without_update (gimple_stmt_iterator *, | |
49 | gimple_seq, | |
50 | enum gsi_iterator_update); | |
51 | extern void gsi_insert_seq_before (gimple_stmt_iterator *, gimple_seq, | |
52 | enum gsi_iterator_update); | |
53 | extern void gsi_insert_seq_after_without_update (gimple_stmt_iterator *, | |
54 | gimple_seq, | |
55 | enum gsi_iterator_update); | |
56 | extern void gsi_insert_seq_after (gimple_stmt_iterator *, gimple_seq, | |
57 | enum gsi_iterator_update); | |
58 | extern gimple_seq gsi_split_seq_after (gimple_stmt_iterator); | |
59 | extern void gsi_set_stmt (gimple_stmt_iterator *, gimple); | |
60 | extern void gsi_split_seq_before (gimple_stmt_iterator *, gimple_seq *); | |
61 | extern void gsi_replace (gimple_stmt_iterator *, gimple, bool); | |
62 | extern void gsi_replace_with_seq (gimple_stmt_iterator *, gimple_seq, bool); | |
63 | extern void gsi_insert_before_without_update (gimple_stmt_iterator *, gimple, | |
64 | enum gsi_iterator_update); | |
65 | extern void gsi_insert_before (gimple_stmt_iterator *, gimple, | |
66 | enum gsi_iterator_update); | |
67 | extern void gsi_insert_after_without_update (gimple_stmt_iterator *, gimple, | |
68 | enum gsi_iterator_update); | |
69 | extern void gsi_insert_after (gimple_stmt_iterator *, gimple, | |
70 | enum gsi_iterator_update); | |
71 | extern bool gsi_remove (gimple_stmt_iterator *, bool); | |
72 | extern gimple_stmt_iterator gsi_for_stmt (gimple); | |
73 | extern void gsi_move_after (gimple_stmt_iterator *, gimple_stmt_iterator *); | |
74 | extern void gsi_move_before (gimple_stmt_iterator *, gimple_stmt_iterator *); | |
75 | extern void gsi_move_to_bb_end (gimple_stmt_iterator *, basic_block); | |
76 | extern void gsi_insert_on_edge (edge, gimple); | |
77 | extern void gsi_insert_seq_on_edge (edge, gimple_seq); | |
78 | extern basic_block gsi_insert_on_edge_immediate (edge, gimple); | |
79 | extern basic_block gsi_insert_seq_on_edge_immediate (edge, gimple_seq); | |
80 | extern void gsi_commit_edge_inserts (void); | |
81 | extern void gsi_commit_one_edge_insert (edge, basic_block *); | |
82 | extern gimple_stmt_iterator gsi_start_phis (basic_block); | |
83 | ||
84 | /* Return a new iterator pointing to GIMPLE_SEQ's first statement. */ | |
85 | ||
86 | static inline gimple_stmt_iterator | |
87 | gsi_start_1 (gimple_seq *seq) | |
88 | { | |
89 | gimple_stmt_iterator i; | |
90 | ||
91 | i.ptr = gimple_seq_first (*seq); | |
92 | i.seq = seq; | |
93 | i.bb = i.ptr ? gimple_bb (i.ptr) : NULL; | |
94 | ||
95 | return i; | |
96 | } | |
97 | ||
98 | #define gsi_start(x) gsi_start_1 (&(x)) | |
99 | ||
100 | static inline gimple_stmt_iterator | |
101 | gsi_none (void) | |
102 | { | |
103 | gimple_stmt_iterator i; | |
104 | i.ptr = NULL; | |
105 | i.seq = NULL; | |
106 | i.bb = NULL; | |
107 | return i; | |
108 | } | |
109 | ||
110 | /* Return a new iterator pointing to the first statement in basic block BB. */ | |
111 | ||
112 | static inline gimple_stmt_iterator | |
113 | gsi_start_bb (basic_block bb) | |
114 | { | |
115 | gimple_stmt_iterator i; | |
116 | gimple_seq *seq; | |
117 | ||
118 | seq = bb_seq_addr (bb); | |
119 | i.ptr = gimple_seq_first (*seq); | |
120 | i.seq = seq; | |
121 | i.bb = bb; | |
122 | ||
123 | return i; | |
124 | } | |
125 | ||
126 | /* Return a new iterator initially pointing to GIMPLE_SEQ's last statement. */ | |
127 | ||
128 | static inline gimple_stmt_iterator | |
129 | gsi_last_1 (gimple_seq *seq) | |
130 | { | |
131 | gimple_stmt_iterator i; | |
132 | ||
133 | i.ptr = gimple_seq_last (*seq); | |
134 | i.seq = seq; | |
135 | i.bb = i.ptr ? gimple_bb (i.ptr) : NULL; | |
136 | ||
137 | return i; | |
138 | } | |
139 | ||
140 | #define gsi_last(x) gsi_last_1 (&(x)) | |
141 | ||
142 | /* Return a new iterator pointing to the last statement in basic block BB. */ | |
143 | ||
144 | static inline gimple_stmt_iterator | |
145 | gsi_last_bb (basic_block bb) | |
146 | { | |
147 | gimple_stmt_iterator i; | |
148 | gimple_seq *seq; | |
149 | ||
150 | seq = bb_seq_addr (bb); | |
151 | i.ptr = gimple_seq_last (*seq); | |
152 | i.seq = seq; | |
153 | i.bb = bb; | |
154 | ||
155 | return i; | |
156 | } | |
157 | ||
158 | /* Return true if I is at the end of its sequence. */ | |
159 | ||
160 | static inline bool | |
161 | gsi_end_p (gimple_stmt_iterator i) | |
162 | { | |
163 | return i.ptr == NULL; | |
164 | } | |
165 | ||
166 | /* Return true if I is one statement before the end of its sequence. */ | |
167 | ||
168 | static inline bool | |
169 | gsi_one_before_end_p (gimple_stmt_iterator i) | |
170 | { | |
171 | return i.ptr != NULL && i.ptr->next == NULL; | |
172 | } | |
173 | ||
174 | /* Advance the iterator to the next gimple statement. */ | |
175 | ||
176 | static inline void | |
177 | gsi_next (gimple_stmt_iterator *i) | |
178 | { | |
179 | i->ptr = i->ptr->next; | |
180 | } | |
181 | ||
182 | /* Advance the iterator to the previous gimple statement. */ | |
183 | ||
184 | static inline void | |
185 | gsi_prev (gimple_stmt_iterator *i) | |
186 | { | |
187 | gimple prev = i->ptr->prev; | |
188 | if (prev->next) | |
189 | i->ptr = prev; | |
190 | else | |
191 | i->ptr = NULL; | |
192 | } | |
193 | ||
194 | /* Return the current stmt. */ | |
195 | ||
196 | static inline gimple | |
197 | gsi_stmt (gimple_stmt_iterator i) | |
198 | { | |
199 | return i.ptr; | |
200 | } | |
201 | ||
202 | /* Return a block statement iterator that points to the first non-label | |
203 | statement in block BB. */ | |
204 | ||
205 | static inline gimple_stmt_iterator | |
206 | gsi_after_labels (basic_block bb) | |
207 | { | |
208 | gimple_stmt_iterator gsi = gsi_start_bb (bb); | |
209 | ||
210 | while (!gsi_end_p (gsi) && gimple_code (gsi_stmt (gsi)) == GIMPLE_LABEL) | |
211 | gsi_next (&gsi); | |
212 | ||
213 | return gsi; | |
214 | } | |
215 | ||
216 | /* Advance the iterator to the next non-debug gimple statement. */ | |
217 | ||
218 | static inline void | |
219 | gsi_next_nondebug (gimple_stmt_iterator *i) | |
220 | { | |
221 | do | |
222 | { | |
223 | gsi_next (i); | |
224 | } | |
225 | while (!gsi_end_p (*i) && is_gimple_debug (gsi_stmt (*i))); | |
226 | } | |
227 | ||
228 | /* Advance the iterator to the next non-debug gimple statement. */ | |
229 | ||
230 | static inline void | |
231 | gsi_prev_nondebug (gimple_stmt_iterator *i) | |
232 | { | |
233 | do | |
234 | { | |
235 | gsi_prev (i); | |
236 | } | |
237 | while (!gsi_end_p (*i) && is_gimple_debug (gsi_stmt (*i))); | |
238 | } | |
239 | ||
240 | /* Return a new iterator pointing to the first non-debug statement in | |
241 | basic block BB. */ | |
242 | ||
243 | static inline gimple_stmt_iterator | |
244 | gsi_start_nondebug_bb (basic_block bb) | |
245 | { | |
246 | gimple_stmt_iterator i = gsi_start_bb (bb); | |
247 | ||
248 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
249 | gsi_next_nondebug (&i); | |
250 | ||
251 | return i; | |
252 | } | |
253 | ||
254 | /* Return a new iterator pointing to the first non-debug non-label statement in | |
255 | basic block BB. */ | |
256 | ||
257 | static inline gimple_stmt_iterator | |
258 | gsi_start_nondebug_after_labels_bb (basic_block bb) | |
259 | { | |
260 | gimple_stmt_iterator i = gsi_after_labels (bb); | |
261 | ||
262 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
263 | gsi_next_nondebug (&i); | |
264 | ||
265 | return i; | |
266 | } | |
267 | ||
268 | /* Return a new iterator pointing to the last non-debug statement in | |
269 | basic block BB. */ | |
270 | ||
271 | static inline gimple_stmt_iterator | |
272 | gsi_last_nondebug_bb (basic_block bb) | |
273 | { | |
274 | gimple_stmt_iterator i = gsi_last_bb (bb); | |
275 | ||
276 | if (!gsi_end_p (i) && is_gimple_debug (gsi_stmt (i))) | |
277 | gsi_prev_nondebug (&i); | |
278 | ||
279 | return i; | |
280 | } | |
281 | ||
282 | /* Return the basic block associated with this iterator. */ | |
283 | ||
284 | static inline basic_block | |
285 | gsi_bb (gimple_stmt_iterator i) | |
286 | { | |
287 | return i.bb; | |
288 | } | |
289 | ||
290 | /* Return the sequence associated with this iterator. */ | |
291 | ||
292 | static inline gimple_seq | |
293 | gsi_seq (gimple_stmt_iterator i) | |
294 | { | |
295 | return *i.seq; | |
296 | } | |
297 | ||
298 | #endif /* GCC_GIMPLE_ITERATOR_H */ |